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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>1.常见文本标签</title>
</head>

<body>
    <h1>1级标题标签</h1>
    <h2>2级标题标签</h2>
    <h3>3级标题标签</h3>
    <h4>4级标题标签</h4>
    <h5>5级标题标签</h5>
    <h6>6级标题标签</h6>

    <p>段落，<strong> 加粗</strong>， <i>斜体</i></p>

    <ul>
        <li>无序列表元素1</li>
        <li>无序列表元素2</li>
    </ul>

    <ol>
        <li>有序列表元素1</li>
        <li>有序列表元素2</li>
    </ol>

    <h1>TABLE row</h1>
    <h1>TABLE data</h1>
    <h1>TABLE header</h1>

    <table border="1">
        <tr>
            <th>列标题1</th>
            <th>列标题2</th>
            <th>列标题3</th>
        </tr>
        <tr>
            <td>元素1</td>
            <td>元素2</td>
            <td>元素3</td>
        </tr>
        <tr>
            <td>元素21</td>
            <td>元素22</td>
            <td>元素23</td>
        </tr>
    </table>
</body>

</html>